A new critical point on the stress-strain curve: Delineation of dynamic recrystallization from grain growth

摘要

A new critical point termed 'stabilisation stress' (sigma(stab)) is identified in high temperature stress-strain curves. sigma(stab) represents the beginning of a stage in the hot working process where grain growth becomes the dominant microstructural phenomenon. This point is detected using an irreversible thermodynamics approach. Predicted correlations between sigma(stab) and grain growth are experimentally validated for structural steels, enabling the delineation of dynamic recrystallization from grain growth based on stress-strain curves. (C) 2016 Elsevier Ltd. All rights reserved.